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<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mstensho@chromium.org">
<link rel="help" href="https://www.w3.org/TR/CSS22/box.html#collapsing-margins" title="8.3.1 Collapsing margins">
<link rel="help" href="http://crbug.com/962175">
<link rel="match" href="../../reference/ref-filled-green-100px-square-only.html">
<meta name="assert" content="A percentage height is unresolvable (i.e. gets treated as auto) if the containing block is auto.">
<p>Test passes if there is a filled green square.</p>
<div style="height:200px;">
  <div style="overflow:hidden; width:100px; background:green;">
    <div style="margin-bottom:100px;"></div>
    <div style="height:30%;"></div>
    <div style="margin-top:100px;"></div>
  </div>
</div>